Dichroic mixtures

Details Dichroic mixtures Dichroic mixtures

2002-01-28

2008-09-02

Visconti, Geraldina (Department: 1795)

Compositions

Liquid crystal compositions

C252S299100, C252S299200, C252S299610, C252S299620, C428S001100, C430S020000

Reexamination Certificate

active

07419620

ABSTRACT:
A mesogenic, crosslinkable mixture comprising at least one polymerisable liquid crystal and at least one polymerisable dichroic dye of the general formula I:whereinA represents a dichroic residue exhibiting at least partial absorption in the visible region >400 nm; n1, n2, n3, n4 signifies 0 or 1 whereby the sum of n1, n2, n3 and n4 is >0, and B1and B4represent a group of substructure IIwherein the broken line symbolises the linkage to said dichroic residue.

REFERENCES:
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patent: 4943617 (1990-07-01), Etzbach et al.
patent: 5707544 (1998-01-01), Kelly
patent: 6007745 (1999-12-01), Coates et al.
patent: 2006/0188663 (2006-08-01), Peglow et al.
patent: 0 369 376 (1990-05-01), None
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patent: 00/54111 (2000-09-01), None
Database WPI, Section Ch, Week 199848, Derwent Publications Ltd., London, GB; Class A41, AN 1998-563355; XP002180180 & JP 10 251537 A (Menicon Co Ltd), Sep. 22, 1998 abstract.

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